package com.jiang.filter;

import com.alibaba.fastjson.JSONObject;
import com.jiang.pojo.Result;
import com.jiang.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.apache.catalina.util.StringUtil;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.net.http.HttpRequest;

@Slf4j
@WebFilter(urlPatterns = "/*")
public class LoginCheckfilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;

        // 1.获取请求的url
        String url =  req.getRequestURL().toString();
        log.info("请求的url {}",url);

        // 2.判断请求的url中是否包含login，若包含 直接放行
        if(url.contains("login")){
            log.info("登录操作，放行...");
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }

        // 3.获取请求中的令牌（token）
        String jwt = req.getHeader("token");

        // 4.判断令牌是否存在 如果不存在 返回错误结果-》未登录
        if(!StringUtils.hasLength(jwt)){

            log.info("请求头token为空 返回未登录的信息");
            Result error = Result.error("NOT_LOGIN");
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return;
        }

        // 5.解析token 如果解析失败 返回错误结果
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            e.printStackTrace();
            log.info("解析令牌失败 返回未登录的错误信息");
            Result error = Result.error("NOT_LOGIN");
            String notLogin = JSONObject.toJSONString(error);
            resp.getWriter().write(notLogin);
            return;
        }

        // 6.放行
        log.info("令牌合法  放行");
        filterChain.doFilter(servletRequest,servletResponse);

    }
}
